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Abstract

Specimen size, crack depth and loading conditions may
affect the materials fracture toughness. In order to
safeguard against these geometry effects, fracture
toughness testing standards prescribe the use of highly
constrained deep cracked bend specimens having a
sufficient size to guarantee conservative fracture
toughness values. One of the more advanced testing
standards, for brittle fracture, is the Master Curve
standard ASTM E1921, which is based on technology
developed at VTT Industrial Systems. When applied to a
structure with low constraint geometry, the standard
fracture toughness estimates may lead to strongly
over-conservative estimate of structural performance. In
some cases this may lead to unnecessary repairs or even
to an early "retirement" of the structure. In the case of
brittle fracture, essentially three different methods to
quantify constraint have been proposed, J-small scale
yielding correction (SSYC), Q-parameter and the Tstress.

Original language

English

Title of host publication

SAFIR The Finnish Research Programme on Nuclear Power Plant Safety 2003 - 2006

abstract = "Specimen size, crack depth and loading conditions may affect the materials fracture toughness. In order to safeguard against these geometry effects, fracture toughness testing standards prescribe the use of highly constrained deep cracked bend specimens having a sufficient size to guarantee conservative fracture toughness values. One of the more advanced testing standards, for brittle fracture, is the Master Curve standard ASTM E1921, which is based on technology developed at VTT Industrial Systems. When applied to a structure with low constraint geometry, the standard fracture toughness estimates may lead to strongly over-conservative estimate of structural performance. In some cases this may lead to unnecessary repairs or even to an early {"}retirement{"} of the structure. In the case of brittle fracture, essentially three different methods to quantify constraint have been proposed, J-small scale yielding correction (SSYC), Q-parameter and the Tstress.",

N2 - Specimen size, crack depth and loading conditions may
affect the materials fracture toughness. In order to
safeguard against these geometry effects, fracture
toughness testing standards prescribe the use of highly
constrained deep cracked bend specimens having a
sufficient size to guarantee conservative fracture
toughness values. One of the more advanced testing
standards, for brittle fracture, is the Master Curve
standard ASTM E1921, which is based on technology
developed at VTT Industrial Systems. When applied to a
structure with low constraint geometry, the standard
fracture toughness estimates may lead to strongly
over-conservative estimate of structural performance. In
some cases this may lead to unnecessary repairs or even
to an early "retirement" of the structure. In the case of
brittle fracture, essentially three different methods to
quantify constraint have been proposed, J-small scale
yielding correction (SSYC), Q-parameter and the Tstress.

AB - Specimen size, crack depth and loading conditions may
affect the materials fracture toughness. In order to
safeguard against these geometry effects, fracture
toughness testing standards prescribe the use of highly
constrained deep cracked bend specimens having a
sufficient size to guarantee conservative fracture
toughness values. One of the more advanced testing
standards, for brittle fracture, is the Master Curve
standard ASTM E1921, which is based on technology
developed at VTT Industrial Systems. When applied to a
structure with low constraint geometry, the standard
fracture toughness estimates may lead to strongly
over-conservative estimate of structural performance. In
some cases this may lead to unnecessary repairs or even
to an early "retirement" of the structure. In the case of
brittle fracture, essentially three different methods to
quantify constraint have been proposed, J-small scale
yielding correction (SSYC), Q-parameter and the Tstress.